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Each Vertex™ Refractometer features our Clear View oversized display to ensure the easiest, most accurate readings possible in two scales (±1.0% salinity and ±0.001 specific gravity). Vertex™ Refractometers also feature Automatic Temperature Calibration (ATC). Simply put, the unit will self-adjust all samples to the proper reading temperature, increasing the ease of use. Additionally, the insulated, non-slip rubber grip will keep external sources of heat, such as hand warmth, from interfering with an accurate sample reading.

I just tried this today. I really like the fact you can fine tune the image you view. That way, people like me who have to wear glasses can compensate for our less than perfect vision. It is accurate as compared to the test my LFS did for me. The only thing that I don’t like is that it needs a really strong light to get a good view